CN102676707A - Efficient and energy-saving xylose producing process - Google Patents
Efficient and energy-saving xylose producing process Download PDFInfo
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- CN102676707A CN102676707A CN2012101517054A CN201210151705A CN102676707A CN 102676707 A CN102676707 A CN 102676707A CN 2012101517054 A CN2012101517054 A CN 2012101517054A CN 201210151705 A CN201210151705 A CN 201210151705A CN 102676707 A CN102676707 A CN 102676707A
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- SRBFZHDQGSBBOR-IOVATXLUSA-N D-xylopyranose Chemical compound O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 title claims abstract description 54
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 title claims abstract description 27
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title abstract description 26
- 239000003456 ion exchange resin Substances 0.000 claims abstract description 43
- 229920003303 ion-exchange polymer Polymers 0.000 claims abstract description 43
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 claims abstract description 28
- 239000012535 impurity Substances 0.000 claims abstract description 26
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000012528 membrane Substances 0.000 claims abstract description 21
- 238000001035 drying Methods 0.000 claims abstract description 17
- 238000001704 evaporation Methods 0.000 claims abstract description 15
- 230000008020 evaporation Effects 0.000 claims abstract description 15
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 14
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 14
- 239000004571 lime Substances 0.000 claims abstract description 14
- 230000007062 hydrolysis Effects 0.000 claims abstract description 13
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 13
- 239000000049 pigment Substances 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 8
- 238000002425 crystallisation Methods 0.000 claims abstract description 7
- 230000008025 crystallization Effects 0.000 claims abstract description 7
- 229960003487 xylose Drugs 0.000 claims description 76
- 239000007788 liquid Substances 0.000 claims description 59
- SRBFZHDQGSBBOR-LECHCGJUSA-N alpha-D-xylose Chemical compound O[C@@H]1CO[C@H](O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-LECHCGJUSA-N 0.000 claims description 51
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 48
- 239000000243 solution Substances 0.000 claims description 32
- 240000008042 Zea mays Species 0.000 claims description 22
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 22
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 22
- 235000005822 corn Nutrition 0.000 claims description 22
- 150000002500 ions Chemical group 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 125000000129 anionic group Chemical group 0.000 claims description 16
- 239000012141 concentrate Substances 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 12
- 239000002253 acid Substances 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 11
- 239000013078 crystal Substances 0.000 claims description 10
- 230000002378 acidificating effect Effects 0.000 claims description 9
- 238000005341 cation exchange Methods 0.000 claims description 8
- 238000009834 vaporization Methods 0.000 claims description 7
- 230000008016 vaporization Effects 0.000 claims description 7
- 230000003472 neutralizing effect Effects 0.000 claims description 6
- 238000000108 ultra-filtration Methods 0.000 claims description 6
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 5
- 239000003377 acid catalyst Substances 0.000 claims description 5
- -1 albumen Substances 0.000 claims description 5
- 238000009835 boiling Methods 0.000 claims description 5
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 239000000084 colloidal system Substances 0.000 claims description 5
- 238000005336 cracking Methods 0.000 claims description 5
- 229910017053 inorganic salt Inorganic materials 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000012047 saturated solution Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000002834 transmittance Methods 0.000 claims description 5
- 229920001221 xylan Polymers 0.000 claims description 5
- 150000004823 xylans Chemical class 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 4
- 230000008929 regeneration Effects 0.000 abstract description 10
- 238000011069 regeneration method Methods 0.000 abstract description 10
- 238000000926 separation method Methods 0.000 abstract description 5
- 238000005342 ion exchange Methods 0.000 abstract description 3
- 239000002351 wastewater Substances 0.000 abstract description 3
- 230000018109 developmental process Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000005119 centrifugation Methods 0.000 abstract 1
- 238000005202 decontamination Methods 0.000 abstract 1
- 230000003588 decontaminative effect Effects 0.000 abstract 1
- 238000004806 packaging method and process Methods 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 15
- 239000002585 base Substances 0.000 description 14
- 239000003513 alkali Substances 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 230000002950 deficient Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000000909 electrodialysis Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 208000007578 phototoxic dermatitis Diseases 0.000 description 2
- 208000008589 Obesity Diseases 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- TVXBFESIOXBWNM-UHFFFAOYSA-N Xylitol Natural products OCCC(O)C(O)C(O)CCO TVXBFESIOXBWNM-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000013375 chromatographic separation Methods 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
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- 206010012601 diabetes mellitus Diseases 0.000 description 1
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- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 235000003599 food sweetener Nutrition 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 229910001410 inorganic ion Inorganic materials 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- HEBKCHPVOIAQTA-UHFFFAOYSA-N meso ribitol Natural products OCC(O)C(O)C(O)CO HEBKCHPVOIAQTA-UHFFFAOYSA-N 0.000 description 1
- 235000013615 non-nutritive sweetener Nutrition 0.000 description 1
- 235000020824 obesity Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 239000003765 sweetening agent Substances 0.000 description 1
- 235000010447 xylitol Nutrition 0.000 description 1
- 239000000811 xylitol Substances 0.000 description 1
- HEBKCHPVOIAQTA-SCDXWVJYSA-N xylitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)CO HEBKCHPVOIAQTA-SCDXWVJYSA-N 0.000 description 1
- 229960002675 xylitol Drugs 0.000 description 1
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Abstract
The invention discloses an efficient and energy-saving xylose producing process, which comprises the following steps of: A, corncob hydrolysis; B, lime neutralization; C, cartridge filtration; D, continuous membrane decontamination; E, continuous membrane concentration; F, primary ion exchange; G, primary evaporation; H, activated carbon decoloration; I, secondary ion exchange; J, secondary evaporation; K, third-time evaporation; L, crystallization; M, centrifugation; N, drying; and O, finished product packaging. The process disclosed by the invention has the beneficial effects that impurities and pigment are removed by membrane separation and concentration, the usage amount of activated carbon is reduced, steam consumption is reduced, the pollution load of ion exchange resin is reduced, the regeneration period of the ion exchange resin is prolonged, the discharge of waste water of the producing process is reduced, the production efficiency is improved, and the production cost is reduced, so that the sustainable development ability of an enterprise is promoted.
Description
Technical field
The present invention relates to the xylose production process technical field, particularly a kind of energy-efficient xylose production process.
Background technology
Wood sugar is a kind of white, needle-shaped crystals or crystalline powder, and it is sweet to distinguish the flavor of, and sugariness has only 40% of sucrose, and is soluble in water, is slightly soluble in ethanol, and 147 ~ 150 ℃ of fusing points have dextrorotation photosensitiveness and mutarotation photosensitiveness.It is a kind of important chemical material, in food, beverage, as non-caloric sweetener, is applicable to obesity and diabetic subject.In the industry, mainly through the hydrogenation preparing Xylitol, in fields such as food, medicine, chemical industry, leather, dyestuffs, wood sugar all has purposes widely to wood sugar.In recent years abroad, wood sugar is quite favored as sweetening agent, and demand is growing.
The production technique of wood sugar has multiple route at present, mainly contains neutralisation deacidifying process and IX deacidifying process, and wood sugar preparation technology also has electrodialysis depickling method, crystalline xylose method and chromatographic separation method in addition.With market competition; In with deacidifying process and IX deacidifying process be that two of domestic comparative maturity overlaps production technique; And the IX deacidifying process since in having solved preferably with the defective of deacidifying process, use widely with deacidifying process in therefore in industry, having.Electrodialysis depickling method is still under test, does not also have suitability for industrialized production.The crystalline xylose method is the fairly simple production technique of a cover, but productive rate not high be the defective of this technology.The chromatography product purity is high, and quality is good, and energy consumption is also low, but the domestic state of the art that does not also possess suitability for industrialized production.
Present traditional xylose production process adopts IX depickling method production technique, and its step is following: corn cob hydrolysis → lime neutralization → activated carbon decolorizing → once leave friendship → double evaporation-cooling → three time evaporation → crystallization → centrifugal → drying → finished product from friendship → single vaporization → secondary activated carbon decolorizing → secondary.This technology is used lime neutralizing hydrolysis liquid, has removed part SO4
2-, also brought number of C a into
2+, having increased the burden of cationic exchange coloum, resin demand is more; The technology more complicated; Equipment is many, and investment is big; Increase acid and alkali consumption, strengthened cost.
Under the existing technology, come out in order to make xylose crystalline, need: the transparence of hydrolyzed solution is improved in (1), adds pigment and suspended substance in a large amount of charcoal absorption hydrolyzed solutions; (2) concentration of impurity in the reduction hydrolyzed solution makes spent ion exchange resin realize the removal of impurity in the hydrolyzed solution; (3) xylose concentration of raising hydrolyzed solution adopts traditional evaporation concentration mode to realize that carrying of wood sugar liquid is dense.For guaranteeing to reach this purpose, existing technology must adopt activated carbon decolorizing twice, twice ion exchange, three evaporation concentration.Inevitably bring following defective thus: technical process is complicated, and is handling loaded down with trivial details; Gac consumption is big; The evaporation consumption is big; Acid and alkali consumption is big; Level of automation is low, and labour intensity is big; The resin regeneration cycle is short; The regenerative wastewater amount is big.
Film is a kind of macromolecular material with special selective separation function, and it can become two parts not communicating to fluid partitioning, one or more materials wherein can be seen through, and other separating substances is come out.Membrane separation technique is based on the sieve effect of porous-film and the separating substances of carrying out technology.Characteristics such as it has efficiently, energy-saving and environmental protection separate with high precision have been widely used in fields such as medicine, chemical industry, electronics, food, environmental protection, become 21 century one of the most great industrial technology.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, a kind of energy-efficient xylose production process that reduces spent process water discharging and heat energy consumption, reduces production costs is provided.
The object of the invention is realized through following technical scheme: a kind of energy-efficient xylose production process, and it may further comprise the steps:
A, corn cob hydrolysis: corn cob is mixed by weight 1:50～1:70 with water, and add the weak acid catalyzer of corn cob weight 0.2 ~ 1.5%, carry out cracking at 155 ℃ ~ 180 ℃ boiling 30min ~ 120min, with the xylan stripping in the corn cob;
B, lime neutralization: in hydrolyzed solution, add lime, the acid catalyst in the neutralizing hydrolysis liquid, regulating PH is 1～3, filters through useless carbon again, filters and removes part suspended substance and pigment, reduces the load of the continuous removal of impurities of symphysis;
C, security personnel filter: the filtrating warp 5 μ m bag type filterings with step B, remove degranulation, suspended substance;
D, the continuous removal of impurities of symphysis: using molecular weight is the ultra-filtration membrane of 1000 ~ 2000Da; Adopt continuous removal of impurities mode to hold back impurity such as albumen, colloid, pigment, calcium magnesium inorganic salt; Reduce the consumption to gac of later stage activated carbon decolorizing operation, adopted continuous removal of impurities mode simultaneously, simplified Production Flow Chart; Improve the continuity of production process, the hydrolyzed solution transmittance is reached more than 80%;
E, symphysis continue concentrated: hydrolyzed solution uses molecular weight to carry out continuous concentration as the nf membrane of 150Da again, sloughs sour water, and the wood sugar liquid refractive power after concentrating can reach more than 12; Nf membrane is carried wood sugar liquid dense on the one hand, significantly reduces the steam consumption of subsequent evaporation operation; Depickling water promptly reduces sulfate ion content, reduces the frequency of follow-up ion exchange resin regeneration, has also just reduced the spent acid that regeneration is produced, the discharging of alkali lye;
F, primary ions exchange: the wood sugar liquid behind membrane-concentrated gets into ion exchange resin and carries out the primary ions exchange, and IX is sun-male-female in proper order;
G, single vaporization: the wood sugar liquid after handing over carries out preliminary heat and concentrates, and being concentrated into the hydrolyzed solution refractive power is 20～30;
H, activated carbon decolorizing: in above-mentioned liquid concentrator, add 0.5% gac, stir decolouring 0.5～1.5 hour, remove gac through Plate Filtration again;
I, secondary ions exchange: the wood sugar liquid concentrator after the decolouring also must get into ion exchange resin and carry out the IX second time, and IX is male-female-Yang-the moon in proper order;
J, double evaporation-cooling: the xylose solution after the secondary ions exchange is carried out heat once more concentrate, being concentrated into the refractive power of wood sugar liquid is 50～70;
K, three evaporations: the liquid concentrator behind the double evaporation-cooling is evaporated for the third time, until feed liquid is evaporated to state of saturation;
L, crystallization: saturated solution carries out decrease temperature crystalline, is chilled to normal temperature;
M, centrifugal: use link-suspended basket centrifuge to separate xylose mother liquid and wood sugar crystal;
N, drying: adopt the blowing-type baking oven that the wood sugar crystal is carried out drying, drying temperature is controlled at 80～90 ℃;
O, finished product:, get product with the packing of dry wood sugar crystal.
Described ion exchange resin is styrene type strong base anionic ion-exchange resins, styrene type weak base type anionic ion-exchange resins and styrene type strongly acidic cation-exchange.
The present invention has the following advantages:
The present invention combines the unique advantage of modern membrane sepn utilisation technology, based on unique separation principle that membrane sepn had, in the creationary wood sugar technology that this technology introducing is traditional; Carried out other clean cut separation of molecular level; In lime with in the middle of technology and an activated carbon decolorizing technology, add the continuous impurity removal process of symphysis, replace the consumption to gac of an activated carbon decolorizing operation, adopt continuous removal of impurities mode simultaneously; Simplify Production Flow Chart, improve the continuity of production process;
It is continuous concentrated that liquid carries out symphysis again after the continuous removal of impurities of symphysis: hydrolyzed solution uses molecular weight to carry out continuous concentration as the nf membrane of 150Da again, sloughs sour water, and the wood sugar liquid refractive power after concentrating can reach more than 12.Nf membrane is carried wood sugar liquid dense on the one hand, significantly reduces the steam consumption of subsequent evaporation operation; Depickling water promptly reduces sulfate ion content, reduces the frequency of follow-up ion exchange resin regeneration, has also just reduced the spent acid that regeneration is produced, the discharging of alkali lye;
The present invention has reduced the usage quantity of gac, is merely 30% of traditional technology amount of activated; Adopting continuous film to concentrate mode replaces heat to concentrate; Can the diopter of wood sugar primary ions exchange liquid be risen to about 10 by 4; And through adding water elution dialysis sulfate ion; Wood sugar liquid through behind the membrane-concentrated gets into the single vaporization device again, can significantly reduce steam consumption, is about 40% of former consumption; Adopt ultra-filtration membrane effectively to remove other impurity in the corn cob hydrolyzed solution; Reduced the pollution load of ion-exchange resins; Prolong the exchange cycle of ion exchange resin, reduced the ion-exchange resins regeneration frequency, and then reduced the acidic and alkaline waste water quantity discharged that produces because of resin regeneration; Acid and alkali consumption reduces by 40%, reduces sewage discharge 50%.
Generally speaking, the present invention has reduced resin from the load and the consumption of handing over, reduced factory effluent discharging and heat energy consumption, improved production efficiency, reduced production cost, promoted the ability of Sustainable Development of Enterprises.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Below in conjunction with embodiment the present invention is done further description:
Embodiment 1:
This embodiment is a most preferred embodiment of the present invention.
A kind of energy-efficient xylose production process, as shown in Figure 1, it may further comprise the steps:
A, corn cob hydrolysis: corn cob is mixed by weight 1:60 with water, and to add the corn cob weight percent be 1 weak acid catalyzer, carry out cracking at 170 ℃ of boiling 80min, with the xylan stripping in the corn cob;
B, lime neutralization: in hydrolyzed solution, add lime, the acid catalyst in the neutralizing hydrolysis liquid, regulating PH is 2, filters through useless carbon again;
C, security personnel filter: will go up step filtrating through 5 μ m bag type filterings, and remove degranulation, suspended substance;
D, the continuous removal of impurities of symphysis: use the ultra-filtration membrane of molecular weight as 1000Da; Adopt continuous removal of impurities mode to hold back impurity such as albumen, colloid, pigment, calcium magnesium inorganic salt; Reduce the consumption to gac of later stage activated carbon decolorizing operation, adopted continuous removal of impurities mode simultaneously, simplified Production Flow Chart; Improve the continuity of production process, the hydrolyzed solution transmittance is reached more than 80%;
E, symphysis continue concentrated: hydrolyzed solution uses molecular weight to carry out continuous concentration as the nf membrane of 150Da again, sloughs sour water, and the refractive power of the wood sugar liquid after concentrating is more than 12; Nf membrane is carried wood sugar liquid dense on the one hand, significantly reduces the steam consumption of subsequent evaporation operation; Simultaneously can also remove some micromolecular organic impurity and pigments once more, reduce the amount of activated in the bleaching process; Through removing the inorganic ion of a part of divalence or high price once more, reduce the frequency of follow-up ion exchange resin regeneration, also just reduced the spent acid that regeneration is produced, the discharging of alkali lye;
F, primary ions exchange: the wood sugar liquid behind membrane-concentrated gets into ion exchange resin and carries out the primary ions exchange; IX is sun-male-female in proper order, and described ion exchange resin is styrene type strong base anionic ion-exchange resins, styrene type weak base type anionic ion-exchange resins and styrene type strongly acidic cation-exchange;
G, single vaporization: the wood sugar liquid after handing over carries out preliminary heat and concentrates, and being concentrated into the hydrolyzed solution refractive power is 25;
H, activated carbon decolorizing: in above-mentioned liquid concentrator, add 0.5% gac, stir decolouring 0.5 hour, pass through sheet frame (filter cloth) again and remove gac;
I, secondary ions exchange: the wood sugar liquid concentrator after the decolouring also must get into ion exchange resin and carry out the IX second time; From friendship is male-female-Yang-the moon in proper order, and described ion exchange resin is styrene type strong base anionic ion-exchange resins, styrene type weak base type anionic ion-exchange resins and styrene type strongly acidic cation-exchange;
J, double evaporation-cooling: the xylose solution after the secondary ions exchange is carried out heat once more concentrate, being concentrated into the refractive power of wood sugar liquid is 60;
K, three evaporations: the liquid concentrator behind the double evaporation-cooling is evaporated for the third time, until feed liquid is evaporated to state of saturation;
L, crystallization: saturated solution carries out decrease temperature crystalline, is chilled to normal temperature;
M, centrifugal: use link-suspended basket centrifuge to separate xylose mother liquid and wood sugar crystal;
N, drying: adopt the blowing-type baking oven to its drying, drying temperature is controlled at 90 ℃;
O, finished product:, get product with the brilliant packing of dry wood sugar.
Embodiment 2:
A kind of energy-efficient xylose production process, as shown in Figure 1, it may further comprise the steps:
A, corn cob hydrolysis: corn cob is mixed by weight 1:50 with water, and to add the corn cob weight percent be 0.2 weak acid catalyzer, carry out cracking at 155 ℃ of boiling 120min, with the xylan stripping in the corn cob;
B, lime neutralization: in hydrolyzed solution, add lime, the acid catalyst in the neutralizing hydrolysis liquid, regulating PH is 1, filters through useless carbon again;
C, security personnel filter: will go up step filtrating through 5 μ m bag type filterings, and remove degranulation, suspended substance;
D, the continuous removal of impurities of symphysis: use the ultra-filtration membrane of molecular weight as 1500Da, adopt continuous removal of impurities mode to hold back impurity such as albumen, colloid, pigment, calcium magnesium inorganic salt, the hydrolyzed solution transmittance reaches more than 80%;
E, symphysis continue concentrated: hydrolyzed solution uses molecular weight to carry out continuous concentration as the nf membrane of 150Da again, sloughs sour water, and the refractive power of the wood sugar liquid after concentrating is more than 12;
F, primary ions exchange: the wood sugar liquid behind membrane-concentrated gets into ion exchange resin and carries out the primary ions exchange; IX is sun-male-female in proper order, and described ion exchange resin is styrene type strong base anionic ion-exchange resins, styrene type weak base type anionic ion-exchange resins and styrene type strongly acidic cation-exchange;
G, single vaporization: the wood sugar liquid after handing over carries out preliminary heat and concentrates, and being concentrated into the hydrolyzed solution refractive power is 20;
H, activated carbon decolorizing: in above-mentioned liquid concentrator, add 0.5% gac, stir decolouring 0.5 hour, pass through sheet frame (filter cloth) again and remove gac;
I, secondary ions exchange: the wood sugar liquid concentrator after the decolouring also must get into ion exchange resin and carry out the IX second time; From friendship is male-female-Yang-the moon in proper order, and described ion exchange resin is styrene type strong base anionic ion-exchange resins, styrene type weak base type anionic ion-exchange resins and styrene type strongly acidic cation-exchange;
J, double evaporation-cooling: the xylose solution after the secondary ions exchange is carried out heat once more concentrate, being concentrated into the refractive power of wood sugar liquid is 50;
K, three evaporations: the liquid concentrator behind the double evaporation-cooling is evaporated for the third time, until feed liquid is evaporated to state of saturation;
L, crystallization: saturated solution carries out decrease temperature crystalline, is chilled to normal temperature;
M, centrifugal: use link-suspended basket centrifuge to separate xylose mother liquid and wood sugar crystal;
N, drying: adopt the blowing-type baking oven to its drying, drying temperature is controlled at 80 ℃;
O, finished product:, get product with the brilliant packing of dry wood sugar.
Embodiment 3:
A kind of energy-efficient xylose production process, as shown in Figure 1, it may further comprise the steps:
A, corn cob hydrolysis: corn cob is mixed by weight 1:70 with water, and to add the corn cob weight percent be 1.5 weak acid catalyzer, carry out cracking at 180 ℃ of boiling 30min, with the xylan stripping in the corn cob;
B, lime neutralization: in hydrolyzed solution, add lime, the acid catalyst in the neutralizing hydrolysis liquid, regulating PH is 3, filters through useless carbon again;
C, security personnel filter: will go up step filtrating through 5 μ m bag type filterings, and remove degranulation, suspended substance;
D, the continuous removal of impurities of symphysis: use the ultra-filtration membrane of molecular weight as 2000Da, adopt continuous removal of impurities mode to hold back impurity such as albumen, colloid, pigment, calcium magnesium inorganic salt, the hydrolyzed solution transmittance reaches more than 80%;
E, symphysis continue concentrated: hydrolyzed solution uses molecular weight to carry out continuous concentration as the nf membrane of 150Da again, sloughs sour water, and the refractive power of the wood sugar liquid after concentrating is more than 12;
F, primary ions exchange: the wood sugar liquid behind membrane-concentrated gets into ion exchange resin and carries out the primary ions exchange; IX is sun-male-female in proper order, and described ion exchange resin is styrene type strong base anionic ion-exchange resins, styrene type weak base type anionic ion-exchange resins and styrene type strongly acidic cation-exchange;
G, single vaporization: the wood sugar liquid after handing over carries out preliminary heat and concentrates, and being concentrated into the hydrolyzed solution refractive power is 30;
H, activated carbon decolorizing: in above-mentioned liquid concentrator, add 0.5% gac, stir decolouring 1.5 hours, pass through sheet frame (filter cloth) again and remove gac;
I, secondary ions exchange: the wood sugar liquid concentrator after the decolouring also must get into ion exchange resin and carry out the IX second time; From friendship is male-female-Yang-the moon in proper order, and described ion exchange resin is styrene type strong base anionic ion-exchange resins, styrene type weak base type anionic ion-exchange resins and styrene type strongly acidic cation-exchange;
J, double evaporation-cooling: the xylose solution after the secondary ions exchange is carried out heat once more concentrate, being concentrated into the refractive power of wood sugar liquid is 70;
K, three evaporations: the liquid concentrator behind the double evaporation-cooling is evaporated for the third time, until feed liquid is evaporated to state of saturation;
L, crystallization: saturated solution carries out decrease temperature crystalline, is chilled to normal temperature;
M, centrifugal: use link-suspended basket centrifuge to separate xylose mother liquid and wood sugar crystal;
N, drying: adopt the blowing-type baking oven to its drying, drying temperature is controlled at 85 ℃;
O, finished product:, get product with the brilliant packing of dry wood sugar.
Claims (2)
1. energy-efficient xylose production process is characterized in that it may further comprise the steps:
A, corn cob hydrolysis: corn cob is mixed by weight 1:50～1:70 with water, and add the weak acid catalyzer of corn cob weight 0.2～1.5%, carry out cracking at 155 ℃～180 ℃ boiling 30min ~ 120min, with the xylan stripping in the corn cob;
B, lime neutralization: in hydrolyzed solution, add lime, the acid catalyst in the neutralizing hydrolysis liquid, regulating PH is 1～3, filters through useless carbon again;
C, security personnel filter: the filtrating warp 5 μ m bag type filterings with step B, remove degranulation, suspended substance;
D, the continuous removal of impurities of symphysis: using molecular weight is the ultra-filtration membrane of 1000 ~ 2000Da, adopts continuous removal of impurities mode to hold back impurity such as albumen, colloid, pigment, calcium magnesium inorganic salt, and the hydrolyzed solution transmittance is reached more than 80%;
E, symphysis continue concentrated: hydrolyzed solution uses molecular weight to carry out continuous concentration as the nf membrane of 150Da again, sloughs sour water, and the wood sugar liquid refractive power after concentrating can reach more than 12, and depickling water promptly reduces sulfate ion content;
F, primary ions exchange: the wood sugar liquid behind membrane-concentrated gets into ion exchange resin and carries out the primary ions exchange, and IX is sun-male-female in proper order;
G, single vaporization: the wood sugar liquid after handing over carries out preliminary heat and concentrates, and being concentrated into the hydrolyzed solution refractive power is 20～30;
H, activated carbon decolorizing: in above-mentioned liquid concentrator, add 0.5% gac, stir decolouring 0.5～1.5 hour, remove gac through Plate Filtration again;
I, secondary ions exchange: the wood sugar liquid concentrator after the decolouring also must get into ion exchange resin and carry out the IX second time, and IX is male-female-Yang-the moon in proper order;
J, double evaporation-cooling: the xylose solution after the secondary ions exchange is carried out heat once more concentrate, being concentrated into the refractive power of wood sugar liquid is 50～70;
K, three evaporations: the liquid concentrator behind the double evaporation-cooling is evaporated for the third time, until feed liquid is evaporated to state of saturation;
L, crystallization: saturated solution carries out decrease temperature crystalline, is chilled to normal temperature;
M, centrifugal: use link-suspended basket centrifuge to separate xylose mother liquid and wood sugar crystal;
N, drying: adopt the blowing-type baking oven that the wood sugar crystal is carried out drying, drying temperature is controlled at 80～90 ℃;
O, finished product:, get product with the packing of dry wood sugar crystal.
2. a kind of energy-efficient xylose production process according to claim 1 is characterized in that: described ion exchange resin is styrene type strong base anionic ion-exchange resins, styrene type weak base type anionic ion-exchange resins and styrene type strongly acidic cation-exchange.
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| CN102943131A (en) * | 2012-11-30 | 2013-02-27 | 安徽丰原发酵技术工程研究有限公司 | Xylose preparation method |
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| CN103409565A (en) * | 2013-07-26 | 2013-11-27 | 山东福田药业有限公司 | Preparation technology of xylose |
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